The speed of a projectile when it reaches its maximum height is one-half its speed when it is at half its maxi- mum height. What is the initial projection angle of the projectile?
Vf2 = vi2 + 2ax
The Attempt at a Solution
I know that the speed at the top only consist of an x component and that the speed at half the height would be sqrt(vx2+vy2) . But I am trying everything from two hours and not getting a solution. The answer is suppost to be 67.8 but I don't know how to get it someone help